<template>
    <div>
        <!--面包屑导航区域-->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>数据统计</el-breadcrumb-item>
            <el-breadcrumb-item>数据报表</el-breadcrumb-item>
        </el-breadcrumb>
        <!--卡片视图区域-->
        <el-card>
            <!-- 2 为 ECharts 准备一个定义了宽高的 DOM -->
            <div id="main" style="width: 700px;height:500px;"></div>
        </el-card>
    </div>
</template>

<script>
// 1 导入echarts
import * as echarts from 'echarts'

import _ from 'lodash'

export default {
    data(){
        return {
          // 需要合并的数据
          options: {
          title: {
            text: '用户来源'
          },
          tooltip: {
            trigger: 'axis',
            axisPointer: {
              type: 'cross',
              label: {
                backgroundColor: '#E9EEF3'
              }
            }
          },
          grid: {
            left: '3%',
            right: '4%',
            bottom: '3%',
            containLabel: true
          },
          xAxis: [
            {
              boundaryGap: false
            }
          ],
          yAxis: [
            {
              type: 'value'
            }
          ]
        }
      }
    },
    created(){

    },
    // 此时页面上的元素已经渲染完毕了
    async mounted(){
        // 3 基于准备好的dom，初始化echarts实例
        var myChart = echarts.init(document.getElementById('main'));

        // 4 准备数据和配置项
        const {data: res} = await this.$http.get('reports/type/1')
        if(res.meta.status !== 200){
          return this.$$message.error('获取折线图数据失败');
        }

        const result = _.merge(res.data, this.options)

      // 展示数据
      myChart.setOption(result)
    },
    methods: {}
}
</script>

<style lang="less" scoped>

</style>